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Accumulated Other Comprehensive Income (Loss) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits $ 30 $ 31 $ 90 $ 91
Provision for income taxes (7) (12) (29) (34)
Net income $ 23 $ 19 $ 61 $ 57